Qt Widget Accessibility Audit

qt-widget-accessibility-audit

Audit Qt Widget and Qt Quick applications for accessibility compliance. This skill checks QAccessible interface implementations, keyboard navigation, screen reader compatibility, and WCAG guidelines adherence.

Capabilities

• Audit QAccessible interface implementations
• Check keyboard navigation and focus handling
• Verify screen reader compatibility
• Validate high contrast and color accessibility
• Check text scaling support
• Review accessible names and descriptions
• Test with platform accessibility tools
• Generate accessibility compliance reports

Input Schema

{
  "type": "object",
  "properties": {
    "projectPath": {
      "type": "string",
      "description": "Path to the Qt project"
    },
    "auditLevel": {
      "enum": ["basic", "wcag-a", "wcag-aa", "wcag-aaa"],
      "default": "wcag-aa"
    },
    "targetPlatform": {
      "enum": ["windows", "macos", "linux"],
      "description": "Platform to focus accessibility checks"
    },
    "checkCategories": {
      "type": "array",
      "items": {
        "enum": ["keyboard", "screen-reader", "visual", "focus", "labels", "navigation"]
      },
      "default": ["keyboard", "screen-reader", "visual", "focus", "labels"]
    },
    "includeQml": {
      "type": "boolean",
      "default": true
    }
  },
  "required": ["projectPath"]
}

Output Schema

{
  "type": "object",
  "properties": {
    "success": { "type": "boolean" },
    "complianceLevel": {
      "enum": ["none", "wcag-a", "wcag-aa", "wcag-aaa"]
    },
    "score": {
      "type": "number",
      "description": "Accessibility score 0-100"
    },
    "issues": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "id": { "type": "string" },
          "severity": { "enum": ["critical", "major", "minor"] },
          "category": { "type": "string" },
          "wcagCriteria": { "type": "string" },
          "description": { "type": "string" },
          "file": { "type": "string" },
          "widget": { "type": "string" },
          "recommendation": { "type": "string" }
        }
      }
    },
    "recommendations": {
      "type": "array",
      "items": { "type": "string" }
    }
  },
  "required": ["success", "issues"]
}

Accessibility Checks

QAccessible Interface

// Check: Widget has accessible name
bool hasAccessibleName(QWidget* widget) {
    return !widget->accessibleName().isEmpty() ||
           !widget->accessibleDescription().isEmpty();
}

// Check: Custom widget implements QAccessibleInterface
class CustomWidget : public QWidget {
    // Must implement for screen readers
    QAccessibleInterface* accessibleInterface() {
        return QAccessible::queryAccessibleInterface(this);
    }
};

Keyboard Navigation

// Check: All interactive widgets are focusable
void auditFocusPolicy(QWidget* widget) {
    if (isInteractive(widget)) {
        if (widget->focusPolicy() == Qt::NoFocus) {
            reportIssue("Interactive widget not focusable", widget);
        }
    }
}

// Check: Tab order is logical
void auditTabOrder(QWidget* container) {
    QList<QWidget*> tabOrder = getTabOrder(container);
    // Verify left-to-right, top-to-bottom order
}

Visual Accessibility

// Check: Sufficient color contrast
bool hasAdequateContrast(QColor foreground, QColor background) {
    double ratio = calculateContrastRatio(foreground, background);
    return ratio >= 4.5; // WCAG AA for normal text
}

// Check: Text is scalable
void auditFontScaling(QWidget* widget) {
    QFont font = widget->font();
    if (font.pixelSize() > 0) {
        reportIssue("Use point size instead of pixel size", widget);
    }
}

Common Issues

Missing Accessible Names

// BAD: No accessible name
QPushButton* btn = new QPushButton(QIcon(":/save.png"), "");

// GOOD: Has accessible name
QPushButton* btn = new QPushButton(QIcon(":/save.png"), "");
btn->setAccessibleName(tr("Save"));
btn->setAccessibleDescription(tr("Save the current document"));

Non-Focusable Controls

// BAD: Custom control not focusable
CustomControl* ctrl = new CustomControl();
ctrl->setFocusPolicy(Qt::NoFocus);

// GOOD: Focusable with keyboard support
CustomControl* ctrl = new CustomControl();
ctrl->setFocusPolicy(Qt::StrongFocus);

Insufficient Contrast

// BAD: Low contrast text
label->setStyleSheet("color: #888888; background: white;");

// GOOD: WCAG AA compliant contrast
label->setStyleSheet("color: #595959; background: white;");

QML Accessibility

// Accessible QML component
Button {
    text: qsTr("Submit")

    Accessible.name: qsTr("Submit form")
    Accessible.description: qsTr("Submit the registration form")
    Accessible.role: Accessible.Button

    // Keyboard handling
    Keys.onReturnPressed: clicked()
    Keys.onEnterPressed: clicked()
}

// Accessible image
Image {
    source: "chart.png"

    Accessible.name: qsTr("Sales chart for Q4 2024")
    Accessible.role: Accessible.Graphic
}

// Focus indicator
Rectangle {
    border.color: parent.activeFocus ? "blue" : "transparent"
    border.width: 2
}

Platform Tools Integration

Windows (UI Automation)

// Verify with Windows Narrator
// Use Accessibility Insights tool
void testWithUIAutomation() {
    // Check UI Automation tree
    // Verify all controls have automation IDs
}

macOS (VoiceOver)

// Verify with VoiceOver
// Check NSAccessibility compliance
void testWithVoiceOver() {
    // Check accessibility hierarchy
    // Verify labels are announced correctly
}

Linux (Orca/AT-SPI)

// Verify with Orca screen reader
// Use Accerciser for AT-SPI inspection
void testWithATSPI() {
    // Check AT-SPI tree
    // Verify accessible events
}

WCAG Guidelines Mapping

Best Practices

1. Set accessible names: All interactive widgets need names
2. Use semantic roles: Proper QAccessible::Role
3. Support keyboard: All features accessible via keyboard
4. Visible focus: Clear focus indicators
5. Color independence: Don't rely on color alone
6. Scalable text: Use point sizes, support scaling

Related Skills

• accessibility-test-runner - Automated testing
• qt-qml-component-generator - Accessible components
• desktop-accessibility process - Full workflow

Related Agents

• accessibility-compliance-auditor - Compliance expertise
• qt-cpp-specialist - Qt implementation guidance